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LEVELLING (Two Peg Test)
Introduction
Two Peg test need to carry out before we start the levelling job to ensure the instrument in good condition 1.0 Aim
Peg Test is a surveying operation carried out to determine if the leveling bubble (bubble axis) and telescope line-of-sight ( line of collimation )are parallel.

2.0 Equipments 3.1 Level and Tripod ( 1 set) 3.2 Staff ( 2 sets ) 3.3 Staff bubble (2 sets ) 3.4 Tape ( 1 set )

3.0 Procedures 4.5 Each group will be required to perform a peg test to check the instrument. 4.6 All person in the group should recorded the result of the peg test in their own field book. 4.7 Two point some 60 m apart are set out and marked the ground (with wooden pegs driven into the earth, or roofing nails in tar) 4.8 The instrument are set up midway between two pegs [figure 3.1] 4.9 The staff are read on each peg (back sight and foresight), and the height difference are calculated. 4.10 The instrument are moved about L/10 = 6m beyond one of the pegs (normally fore staff position). [figure 3.2] 4.11 The staff are read on each peg again, and the height difference are calculated.

I. First, we need to measure by tape 30m from point C to point A and B. Choose flat area for this test and observe the staff A and B.

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II. After that, the auto level move to point D where is about L/10 meter. L is total length from point A to B. Jot down the Staff A and B reading.

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III. Do camparison between 2 set of readings

4.0 Observation Data and Analysis | Reading Staff B (s1) | Reading Staff B (s2) | Height difference=m | First set up | 1.325 | 1.325 | 0 |

| Reading Staff B (s1’) | Reading Staff B (s2’) | Height difference=m’ | Second set up | 1.388 | 1.390 | 0.002 |

Difference(m-m’) | 60m | | |

5.12 if m=m’ then the instrument is ok! 5.13 If NOT then the error is

e= (S1-S2) – (S1’ – S2’ ) / L mm/m =(1.325-1,325) –

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